mcal-ai-langgraph

LangGraph integration for MCAL — Goal-aware memory for AI agents.

Installation

pip install mcal-ai-langgraph

This will automatically install mcal-ai and langgraph as dependencies.

Quick Start

from mcal import MCAL
from mcal_langgraph import MCALStore

# Initialize MCAL
mcal = MCAL(llm_provider="anthropic")

# Create LangGraph-compatible store
store = MCALStore(mcal)

# Use with LangGraph
from langgraph.prebuilt import create_react_agent

agent = create_react_agent(
    model=your_model,
    tools=your_tools,
    store=store  # Goal-aware memory!
)

What's New in 0.5.0

• Query-Aware Subgraph Retrieval — New seed-and-expand pipeline replaces 6 query-blind retrieval paths with a single query-aware pass. Reduces context tokens by 53% at 1020 turns while improving DRR by 4.5pp.
• QuerySubgraph dataclass — New public API for structured subgraph results, partitioned by node type (goals, decisions, facts, entities, actions) with structural edge resolution.
• Adjacency index — Lazy-built bidirectional adjacency index on UnifiedGraph enables O(1) neighbor lookups for graph traversal.
• Improved DRR at scale — CTO-1020 DRR improved from 85.3% to 89.9% (+4.6pp); CTO-300 improved from 92.2% to 94.4% (+2.2pp).
• LoCoMo-10 Evaluation — Full 10-conversation, 1,540 QA binary evaluation: 46.1% overall accuracy.

What's New in 0.4.1

• First-Class FACT Nodes — 3 new typed edges (measures, evidence_for, quantifies) improve fact retrieval; quantitative queries automatically boost fact content
• Importance Scoring Boost — FACT nodes with numeric values score higher in retrieval
• search_facts() API — Filter facts by category and value range on UnifiedGraph
• Version Metadata Fix — __version__ now correctly reports 0.4.1 (was stuck at 0.2.9)

What's New in 0.4.0

• Graph Compaction Fixes — Improved retrieval quality with facts-in-context, expanded edge types, chunk boost scoring
• CTO-1020 Benchmark — 85.3% decision retention over 1020 turns, 95.6% cross-era recall, 88% token reduction
• Statistical Rigor — Multi-run validation with Fisher's exact test, Wilson score confidence intervals

What's New in 0.3.0

• Expanded Relationship Edge Types — 10 new edge types (family, friend, colleague, likes, prefers, lives_in, works_at, etc.) for richer relationship graphs
• Key Facts & Entities in Search Context — search() now surfaces extracted facts and background entities directly in result.context
• Improved Chunk Retrieval — More results returned with equal weighting; conversation excerpts prioritized in context

# Configuration options
memory = MCALMemory(
    llm_provider="anthropic",
    extraction_profile="decision",      # "decision" | "conversational" | "comprehensive"
    enable_chunk_store=True,             # hybrid retrieval
)

Features

MCALStore (BaseStore)

Drop-in replacement for LangGraph's built-in stores with goal-aware memory:

from mcal_langgraph import MCALStore

store = MCALStore(mcal)

# Store memories
await store.aput(
    namespace=("user_123", "memories"),
    key="decision_1",
    value={"text": "Decided to use PostgreSQL for ACID compliance"}
)

# Goal-aware search — returns memories relevant to current goals
results = await store.asearch(
    namespace_prefix=("user_123",),
    query="database choice"
)

# Results include goal context and decisions
for item in results:
    print(item.value)

MCALMemory

Memory nodes for custom LangGraph workflows:

from mcal_langgraph import MCALMemory

# Initialize with provider (uses get_mcal() factory internally)
memory = MCALMemory(llm_provider="anthropic")

# Or pass an existing MCAL instance
memory = MCALMemory(mcal=mcal, user_id="user_123")

# Add as nodes in your graph
graph.add_node("update_memory", memory.update_node())
graph.add_node("get_context", memory.context_node())

MCALCheckpointer

State persistence for LangGraph graphs:

from mcal_langgraph import MCALCheckpointer

checkpointer = MCALCheckpointer(storage_path="~/.mcal")
graph = builder.compile(checkpointer=checkpointer)

Why mcal-ai-langgraph?

API Reference

MCALStore

class MCALStore(BaseStore):
    def __init__(self, mcal: MCAL): ...
    
    # Async API
    async def aput(self, namespace, key, value, index=None): ...
    async def aget(self, namespace, key) -> Optional[Item]: ...
    async def adelete(self, namespace, key): ...
    async def asearch(self, namespace_prefix, /, *, query=None, filter=None, limit=10, offset=0) -> list[Item]: ...
    async def alist_namespaces(self, *, prefix=None, suffix=None, max_depth=None, limit=100, offset=0) -> list[tuple[str, ...]]: ...
    
    # Sync API (also available)
    def put(self, namespace, key, value, index=None): ...
    def get(self, namespace, key) -> Optional[Item]: ...
    def delete(self, namespace, key): ...
    def search(self, namespace_prefix, /, *, query=None, filter=None, limit=10, offset=0) -> list[Item]: ...

MCALMemory

class MCALMemory:
    def __init__(
        self,
        mcal: Optional[MCAL] = None,
        llm_provider: str = "anthropic",
        embedding_provider: str = "openai",
        storage_path: Optional[str] = None,
        user_id: str = "default",
        **mcal_kwargs,
    ): ...
    
    def update_node(self) -> Callable: ...
    def context_node(self) -> Callable: ...
    async def add(self, messages, user_id=None): ...
    async def get_context(self, query, user_id=None): ...
    async def search(self, query, user_id=None, limit=5): ...

MCALCheckpointer

class MCALCheckpointer(BaseCheckpointSaver):
    def __init__(self, storage_path: Optional[str] = None): ...
    
    def get(self, config) -> Optional[dict]: ...
    def put(self, config, checkpoint): ...
    def list(self, config) -> list[dict]: ...

Migrating from mcal[langgraph]

If you were using the old extras-based installation:

# Old way (deprecated)
from mcal.integrations.langgraph import MCALStore

# New way (recommended)
from mcal_langgraph import MCALStore

The old import path still works but will show a deprecation warning.

Requirements

• Python >= 3.11
• mcal-ai >= 0.2.0
• langgraph >= 0.2.0
• langchain-core >= 0.3.0

License

MIT